When the Rangers waived Stephen Valiquette to Hartford on December 2, Johnson was recalled to serve as a backup goaltender to Henrik Lundqvist.

[2] After spending three years with the Rangers' American Hockey League (AHL) affiliate club Hartford Wolf Pack/Connecticut Whale, and playing in six NHL games, Johnson became an unrestricted free agent.

As a free agent from the Sabres, on July 1, 2016, Johnson joined his sixth NHL club in signing a one-year contract with the Calgary Flames.

[8] Johnson began the 2016–17 season, initially serving Brian Elliott as the backup, before he was elevated to shared starts through the midpoint of the year.

On June 17, 2017, Johnson was as an impending free agent was traded back to former club, the Arizona Coyotes, in the Flames acquisition of Mike Smith.

Included in the trade largely for 2017 NHL Expansion Draft considerations, he was dealt alongside prospect Brandon Hickey and a conditional 3rd round pick.

[9] Johnson went to market as a free agent from the Coyotes, and promptly signed a one-year, $2.5 million contract for a second stint with the Buffalo Sabres on July 1, 2017.